docs: def offset(self,
                 geometries,
                 offsetDistance,
                 offsetUnit,
                 offsetHow="esriGeometryOffsetRounded",
                 bevelRatio=10,
                 simplifyResult=False,
                 sr=None,
                 ):
          """
          The offset operation is performed on a geometry service resource. This 
          operation constructs geometries that are offset from the given input geometries.
          
          Inputs:
              geometries - array of geometries to be offset (structured as JSON geometry 
                           objects returned by the ArcGIS REST API).
              sr - spatial reference of the input geometries WKID.
              offsetDistance - the distance for constructing an offset based on the 
                               input geometries.
              offsetUnit - A unit for offset distance. If a unit is not specified, 
                           the units are derived from sr.
              offsetHow - determines how outer corners between segments are handled.
              bevelRatio -  is multiplied by the offset distance, and the result determines 
                            how far a mitered offset intersection can be located 
                            before it is bevelled.
              simplifyResult - if set to true, then self intersecting loops will be 
                               removed from the result offset geometries.
          """
          allowedHow = ["esriGeometryOffsetRounded",
                        "esriGeometryOffsetBevelled",
                        "esriGeometryOffsetMitered"]
          if offsetHow not in allowedHow:
              raise AttributeError("Invalid Offset How value")
          url = self._url + "/offset"
          params = {
              "f" : "json",
              "sr" : sr,
              "geometries": self.__geometryListToGeomTemplate(geometries=geometries),
              "offsetDistance": offsetDistance,
              "offsetUnit" : offsetUnit,
              "offsetHow" : offsetHow,
              "bevelRatio" : bevelRatio,
              "simplifyResult" : simplifyResult
          }
          return self._get(url=url, param_dict=params,
                              securityHandler=self._securityHandler,
                              proxy_url=self._proxy_url,
                             proxy_port=self._proxy_port)